Hi, I haven't been able to figure this problem out:
An assembly line supposedly turns out items that have a weight of 100 pounds each but the population standard deviation is known to be 3 pounds.
What is the probability of taking a random sample from this line and finding that its weight is between 97 pounds and 109 pounds?
A) About 34%
B) About 68%
C) About 84%
D) About 16%
E) About 96%
I really just don't know how to get started with this. We've been talking about null and alternate hypothesis, and we've gone over several example problems. But there hasn't been anything like this though, and it's really throwing me off. Normally, I wouldn't worry about it, but this question is asked repeatedly in different ways, such the probability of being over 100 or less than 91.
Anyways, I would really appreciate some help soon. Thanks!
An assembly line supposedly turns out items that have a weight of 100 pounds each but the population standard deviation is known to be 3 pounds.
What is the probability of taking a random sample from this line and finding that its weight is between 97 pounds and 109 pounds?
A) About 34%
B) About 68%
C) About 84%
D) About 16%
E) About 96%
I really just don't know how to get started with this. We've been talking about null and alternate hypothesis, and we've gone over several example problems. But there hasn't been anything like this though, and it's really throwing me off. Normally, I wouldn't worry about it, but this question is asked repeatedly in different ways, such the probability of being over 100 or less than 91.
Anyways, I would really appreciate some help soon. Thanks!